12/20 – The Chief’s “More Humid Flow Begins” Wednesday Morning Forecast
The general upper high pressure over the lower and middle Mississippi River Valley extends off the eastern seaboard. At the surface, high pressure was centered over West Virginia, with low pressure and associated frontal boundary along the lee side of the Rockies. A large cirrus shield was moving through the southwesterly mid-level flow across the area, but the airmass was pretty…